Looking at the HR or PR examples, it would totally make sense that they see their job as fundamentally unneeded, and would prefer if people stopped doing stupid

Looking at the HR or PR examples, it would totally make sense that they see their job as fundamentally unneeded, and would prefer if people stopped doing stupid/harmful things or made their homework and came to the right institutions by themselves, or the org didn't rely on promoting itself. But the thing is, that won't happen. Not today, not tomorrow, not in 10 years. There will still be HR and PR departments to deal with humans and the stupid ways things need to work. That's like a teacher saying that fundamentally if the kids just opened their book, read the lesson and did their exercise they wouldn't be needed in the first place. But we all know why that's only one ideal scenario and in practice you still need a teacher.